Drag-line excavator



June 9,1925. 1,541,464 H. O. BEDGOOD DRAG LINE EXCAVATOR Filed May 9. 1924 3 Sheets-Sheet 1 Jane's, 1925.

- v 1,541,464 H. o. BEDGOOD DRAG LINE EXCAVATOR Filed May 9, 1924 3 ShetS-Sh e et- 2,

. fiLv/eni'or: )[abam Oswaldlfiqga d June 9, 1925. 1,541,464

" H. O. BEDGOOD DRAG LINE EXCAVATOR 7 Filed May 9, 1924 s shets-sneet 5 4.

Patented June 9, 1925.

'HUBERT OSWALD BEDGOOD, OF GLASGOW,

SCOTLAND, ASSIGNOR T0 Lonm'rz ,& COM- PANY LIMITED, OF RENFR'EW', SCOTLAND. I

DRAG-LINE EXcAvAToR.

Application filed May 9,

To all whom it may concern: 7

Be it known that I, HUBERT OswALn BED- ooon, of Glasgow, Scotland, a subject of the King of Great Britain, have invented certain new and useful Improvements in Drag-Line Excavators, of which the fol lowing is a specification:

This invention relates to what are known as drag-line excavators. In such excavators, as at present in use, the bucket is suspended, usually, fronr the jib or boom by means of a hoisting rope which first passes over a pulley at the end of the boom, then down and round a pulley connected with the bucket, the-nup and over a second" pulley on the boom, and, finally, down again to the .pulley block of the bucket to which it is secured. lVith this arrangement not only are two pulleys required at the end of the boo-1n but the rope suspension is three ply.

lVhen the bucket is dropped the heavy pulley block at the lower end of the tackle frequently strikes the bucket with the result that bucket, block, and rope are damaged. The pulleys being fixed in position on the boom restrict and limit the freedom of movement of the hoisting rope.

The object of the present invention is to provide an arrangement which shall obviate the disadvantages of the present construction by the substitution therefor of a single pivotally suspended pulley at the end of the boom and a duplex or parallel hoisting rope which passes over said pulley and is secured to a icon'iparatively small pulley block for the tipping rope and which is connected with the bucket.

' In order that the invention may be properly understood we will now describe, by way of example, one mode of carrying the invention into practice, reference being made to'the annexed drawings, whereon:-

Fig. 1 is a side elevation of the drag-line excavator.

Fig. 1 is a detail View of part of Fig. 1.

Fig. 2 is a plan, with certain parts removed, of the excavator shown in Fig. 1.

Fig. 3 is a side sectional elevation to an enlarged scale of the end of the boom, with its accessory parts, the section being taken on line 3-3, Fig. 4.

Fig. 4: is an end elevation, partly in sec- 1924. Serial No. 711,950.

or platform 3 is a boom or jib 5 which is operated by means of a derricking rope 6 passing over a multiple block 7 near the forward end of the boom, and a block 8 near the top of the derrick a. The rope 6 is led over a jockey pulley 9 upon the derrick and thence to the derricking drum 10. The drag-rope 11 is connected by a chain 12 and tipping rope 13 to the pulley 13 and bucket 1 1 and passes through a fair lead with guide pulleys 15, 16, to a drag- -drum 17. The drag-drum 17 and the hoisting drum 20 are geared: together and are driven. from a single engine which also drives the drum 10. All the foregoing parts are substantially the same as in. the usual. construction of drag-line excavator and form no part of the present invention.

In accordance with this invention the bucket 14 is provided with a parallel hoisting rope 21 (see also Fig. 1) which passes round the half block 13 secured to the pulley block 13, over a duplex pulley 22 carried on the end of the boom, and thence to the hoisting drum 20. The bucket chain 1 L isattached directly to the pulley block 13. The tipping rope 13 works over the pulley in the block 13.

On referring to Figs. 3, at and 5, it will be seen the pulley 22 is mounted. on a pin 23 in the bloc: 24 which has three arms 24;", 2 1, and 2%, the block being made up of two side plates joined together. A riveted pin 25, provided with a roller, connects the two arms 24 and prevents the duplex rope 21 leaving the pulley. The block 24: is connected to the boom 5 by a connection comprising a block 26 pivoted, by means of a pin 27, to lugs 28 depending from the boom, the block having projecting trnnnions 29 upon which are pivoted the arms 24 of the block 24. In this way the block 24 is free to swing both longitudinally and laterally of the boom so that it can readily aocmm0- date itself to a change in position of the bucket relatively to the boom.

In order to make the suspension of the hoisting pulley more stable, without detracting from its freedom of movement, is also connected to the boom by its arms 2 1 which are pivotally jointed by pins 32, 34, to a. shackle 31 secured to the fixed eye at the end of the boom. The shackle; S1 is pivoted at its lower ends, by means of the pin to a block 33 (see Fig. 5) provided with-a pin or trunnions Se'journalled in. bearings-in the arms 2e. The endsot the trunnions 3st are reduced and screwed at and are provided with washers 36, nuts 37 and split pins 38.

It is obvious the pivotal joint permits the pulley to'swing laterally of the boom, while, when the pulley swings longitudinally about 29 the shackle 81 can work freely in the eye "30.

It will beseen the pulley is so flexibly carried by the pivotal joints that whilst "it'can accommodate itself to all movements of the bucket 1% it is prevented twisting or spinning about its connection to the boom with the resultthat the duplex hoisting rope is not liable to twls't during the raising or lowering of the bucket.

The drag-rope 11 and bucket are operated as usual.

Thewhole arrangement provides a sim- 'phfied and llGXlblB gear capable of being operated 'more rapidly than with the usual.

ype of excavator.

Having now fully described my invention what I claim and desire to secure by Letters Patent is 1. The combination with the boom of a drag-lineexeavator ot. a single pulley over which the bucket hoisting rope is adapted to pass, the pulley being pivotally connected 'to the boom at twoplaces whereby the pul- "ley can "swine g both laterally and longitudi nally of the boom.

The combination with a boom of a {drag-line excavator of a single duplex pulley over which the bucket hoisting rope is adapted to pass andconn'ect onsbetweenthe boom andthe pulley whereby the'latter is 'tion between "the boom andv the pulley block comprising lugs on the boom, and a block pivoted to said lugs and to said pulley block, the axes'of the two pivots being at right angles to one another.

4. The combination with'the boom of a drag line excavator ot a single pulley-over,

which the bucket hoisting rope is adapted to pass, and inflexible mezms connecting said pulley to said boom, said means comprising a pulley block for the pulley, arms on the pulley block, lugs on the boom, and a block pivoted to said armsand to said lugs, the.

axes of the pivots being at right angles'to one another.

The coi'i'ibiuation with the boomof a draggyline exca- '"tor of a single pulley over which the hoi. mg rope is adapted to pass, pulley'block for the pulley, a connection between the boom and the pulley block comprising lugs onthe boom and a block pivoted-to said lugsand to said pulley block, the axes of the two pivots being at right angles to one another, and a second connection betweenthe boom'and the pulley block comprising a fixed eye on the boom, a shackle passingtln-ough said eye, a block fulcrumed to said shackle and also to said pulley blockythe axesof the two fulcrums being at right angles to one another.

(3. A drag-line excavator comprising a movable structure, a boom thereon, a bucket, a bucket hoisting rope, and a pulley on the boom over which said bucket hoisting rope passes to the bucket, said pulley being jointed to the bottom at two places, the planes'ot the pulley in all positions thereof intersecting in a common axis extending along the boom.

In testimony"whereof I atfizc my signature in presence oftwo witnesses.

HUBER'I. 3G SWVALD BEDGOOD.

lVitnessesz l'onN 'Binmnnn Jamison, MARY GREEN. 

